To provide visual appeal.
Idioms add color to the characters in the story. The combination of figurative and literal meanings sparks the imagination of the audience. They also add a sense of humor which makes the story more appealing to the audience. Idioms create interactive effects towards the listeners and/or readers.
Answer:
I believe the correct answer is C. Emphasize or stress a note. I'm not 100% sure but from some research I did, I'd say emphasizing would be the best answer.
